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首页> 外文期刊>Physics in medicine and biology. >High performance volume-of-intersection projectors for 3D-PET image reconstruction based on polar symmetries and SIMD vectorisation
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High performance volume-of-intersection projectors for 3D-PET image reconstruction based on polar symmetries and SIMD vectorisation

机译:用于基于极性对称和SIMD矢量化的3D-PET图像重建的高性能相交投影仪

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摘要

For high-resolution, iterative 3D PET image reconstruction the efficient implementation of forward-backward projectors is essential to minimise the calculation time. Mathematically, the projectors are summarised as a system response matrix (SRM) whose elements define the contribution of image voxels to lines-of-response (LORs). In fact, the SRM easily comprises billions of non-zero matrix elements to evaluate the tremendous number of LORs as provided by state-of-the-art PET scanners. Hence, the performance of iterative algorithms, e.g. maximum-likelihood-expectation-maximisation (MLEM), suffers from severe computational problems due to the intensive memory access and huge number of floating point operations.
机译:对于高分辨率,迭代3D PET图像重建,前后投影仪的有效实现对于最小化计算时间至关重要。从数学上讲,投影仪被概括为系统响应矩阵(SRM),其元素定义了图像体素对响应线(LOR)的贡献。实际上,SRM轻松包含数十亿个非零矩阵元素,以评估由最新的PET扫描仪提供的大量LOR。因此,迭代算法的性能例如最大似然期望最大化(MLEM)由于密集的内存访问和大量的浮点运算而遭受严重的计算问题。

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